Explosive eruptions of pyroclastic debris and gases are associated with which type of volcanoes?
A) Shield volcanoes
B) Composite cone volcanoes
C) Bulging volcanoes
D) Concave volcanoes
Question 2
Hell's Canyon, a narrow, steep-sided valley, on the Idaho- Oregon border is an example of a valley formed by what?
A) Tectonic activity
B) Glaciation
C) Flowing water
D) Volcanic activity